This practice covers procedures for making and curing cylinder and beam specimens from representative samples of fresh concrete for a construction project. C 31/C 31M Practice for Making and Curing Concrete Test 1 This test method is under the jurisdiction of ASTM Committee C09 on. Concrete. ASTM Standards: 2. C 31/C 31M Practice for Making and Curing Concrete Test. Specimens in the Field. C 42/C 42M Test Method for Obtaining and Testing .

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If there are large holes in the end of the cylinder, your lab tech will have to grind it down or saw cut the end of the cylinder, so you want it to be smooth. Google provides ad serving technology and runs an ad network. These notes shall not be considered as requirements of the standard. You can typically get water from a hose on the side of the concrete truck, or you could possibly bring your own water in a sealed container. When you are picking a place to make your cylinders, make sure it is in a level area that is free of debris, away from vibration, and away from moving vehicles and large construction equipment.

Drive carefully, these are the only samples you’ve got. Work Item s – proposed revisions of this standard. After the cylinder has been picked up, checked in, and carefully labelled make sure you have the right sample number and date!

If you are making multiple sets of cylinders with more than one truck, write the number on the batch ticket and on your paperwork so you know which truck goes with which set of cylinders. For a volume license the PDF is licensed to the person in which it is assigned. Prevent the drying of the surfaces of the beams between the removal of the water storage tank and testing.

Distribution of the PDF is not permitted. When transporting cylinders, you will want to make sure they don’t bounce around in the truck or fly out, so you should have some cushioned transport racks to hold them in. This is used to detect comment spam.

Be sure to write on your paperwork which location you are making or leaving your cylinders at, because someone else may be the one to come pick them up.


Use a back-and forth left-to-right sawing motion, starting in the middle and working away from you, then come back to the middle and move the strike-off bar towards you, still performing the same sawing motion. No data is shared with Paypal unless you engage with this feature. Protect the surfaces of both in the same manner the structure is protected, as best as possible. Significance and Use of ASTM C31 Concrete cylinder samples are made for your lab technician to break in a hydraulic press machine and find the compressive strength of the concrete that is being poured for a specific part of a structure.

This is used to collect data on traffic to articles and other pages on our site. This is used to provide data on traffic to our website, all personally identifyable astmm is anonymized.

The cylinder diameter needs to be at least 3 times as wide as the largest piece of aggregate the nominal aggregate sizeso we only make 4x8s when the nominal aggregate size is less than 1.

Some articles have Vimeo videos embedded in them. To strip a cylinder, insert the stripping tool into the top of the mold in the gap between the concrete and the mold, and hammer it all the way to the bottom of the mold.

Ours has shelves labeled with a date, and we store them on the day they are meant to be broken, not the day 31n were made.

ASTM C31 – Making and Curing Concrete Test Specimens in the Field

Javascript software libraries such as jQuery are loaded at endpoints on the googleapis. The ultimate goal of the sampling process is to have a sample that is aztm average representation of what is going into the astk, to get the most accurate strength value in the lab. Cylinder molds — These can be plastic or steel, but we typically use plastic molds.

This practice is not satisfactory for making specimens from concrete not having measurable slump or requiring other sizes or shapes of specimens.

ASTM C31 – Making and Curing Concrete Test Specimens in the Field | Owlcation

If representing pavements of a slab on grade, bank the sides and ends with 311m or sand that must be kept damp, leaving the top surface exposed. Once they are in the moisture room and in the system you are all done. Disposable molds are to be calibrated every time a new lot arrives. It helps to group your equipment by test, so you have everything you need for each test in one place.


You can use this to streamline signing up for, or signing in to your Hubpages account. If steel molds are used, mineral oil will also be needed to lightly coat the inside surface of the mold and keep the concrete from sticking to the mold. Set them on the floor or on the table, whichever you prefer, and grab a stripping tool looks like a t-shaped metal bar and a rubber mallet.

Warning; Fresh hydraulic cementitious mixtures are caustic and may cause chemical burns to exposed skin and 31j upon prolonged exposure. This is used to display charts and graphs on articles and the asttm center. Sample the concrete in accordance with ASTM C, making sure to mix your concrete sample thoroughly. Transportation time of cylinders shall not exceed 4 hours. Please choose which areas of our service you consent to our doing so.

Vibrator optional — Should be internal and operate at a frequency of at least vibrations per minute. This is a cloud services platform that we used to host our service. We may use remarketing pixels from advertising networks such as Google AdWords, Bing Ads, and Facebook in order to advertise the HubPages Service to people that have visited our sites.

ComScore is a media measurement and analytics company providing marketing data and analytics to enterprises, media zstm advertising agencies, and publishers. Rodding is only used if the slump is greater or equal to one inch; if the mix is very dry and the slump comes out to less than an inch you will cc to vibrate the concrete to consolidate it thoroughly.

Strike-off Bar — Must be clean and level and must have a flat and even plane surface.

This supports the Maven widget and search functionality. For both sizes, each layer will be rodded 25 times in an even pattern, distributing the holes uniformly over the cross-section of the mold.

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